[Plugin: Contact Form 7] Ajax issues

I’m using contact form 7 on this site:

https://dev.vintagepaintballpark.com/reservations/

The form submits and an email gets sent, but it sits on the ajax loader image indefinitely. I have wp_head() in the header and wp_footer() in the footer. There are no js errors, and I tried deactivating all plugins but contact form 7 to no avail.

Any ideas?